Why short links are introduced? [closed] - url

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I see in many sites the use of short links like this:
http://www.chipbennett.net/2011/04/28/2011-nfl-draft-colts-round-1/
to this
http://bit.ly/mxytw8
but I wonder to know why they've been used!
The only thing I could imagine is to hide the original link or to gain data weight in a database?

Simply because services like Twitter are limited in the message size. Or to make it easier to type in the address instead of copy/pasting. Could also be misused by spammers or phishing attacks to hide the real address. See http://en.wikipedia.org/wiki/URL_shortening

The user may be doing it to take advantage of link tracking provided by bitly.
Every bitly link has an info page, which reveals the number of related clicks and other relevant data. You can get to the info page in a few different ways.

They're mostly used with Twitter (which has a very short message size) and historically for plain text email where mail readers would line-wrap long URLs in the middle.

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how did google find my site? [closed]

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I created an website. For a week I had an under-construction-page, google did find that paged and indexed it. My question is: How did google find my site, while there were no links to this site and the name has never been used before?
Your domain name went in a domain name server. Google probably found it there.
There are so many websites that automatically gather Whois information of domain names with complete information about them. If you are pretty sure that you have never shown your domain to Google, i guess these websites did this.
You browser (Chrome) or your browser's plugin might have sent an anonimous report of your browsing statistics to Google - you did open your site in a browser right?
You weren't using a robots.txt file blocking Google.

best way to redirect a link to other domain (conditional)? [closed]

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We provide a link (example http://indiapriceinfo.in/getbeststore?mobile_id=76340 ) which redirects user to the online store which is selling it at best price (so the redirection link will lead you to different store on different days).
We use these kind of links on multiple domains with 302 redirection. But they all redirect using indiapriceinfo.in, like the above.
Is this bad for SEO? If it is then whats the best pratice to do it.
A 302 redirect is exactly what you should be doing since the redirects are temporary. The fact that the links all point to pages on the same domain is irrelvant as the links are judged on a per page basis, not per site. So indiapriceinfo.in won't gain anything as a domain SEO wise from these links.

what is the pros/cons to have unique&unpredictable id in url [closed]

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I'm considering to use url pattern like below:
example.com/item/r6B0PmUmx07O/just-one-item
example.com/item/r6B0PGgwPJWl/yet-another-item
the part before slug is an unique and unpredictable id for an item.
compare with url like
example.com/item/1001/just-one-item
example.com/item/1002/yet-another-item
is this way bad for SEO?
or will it be bad for crawling by the search engine?(since the crawler cannot 'guess' the next item's id)
I'm not sure how many popular crawlers try to increment number values in URL to hit the page.
They generaly try to traverse by links.
But consider hiding some info from malicious users. If you can reach any info about your users (by example.com/user/1001) there is generally wrong idea to have sequential UID's. It's not mean to be a part of security but sometimes it's good to difficult access to your data. So the competition will have some difficulties when guessing how much products you have on stock :)
Consider supplying dynamical sitemap with links to all your products. This make you sure that every crawler will hit all your items no matter what key it has.

Google showing website inner search engine results, how does it work? [closed]

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Sometimes when I search in Google, appears a website and just below... several links from that website. Sometimes also (I don't know if it's related) I click on a result and the website shows me the page with the search terms highlighted.
How does that work? I mean, which technology or standard do I have to implement in my website in order to archieve those effects?
Thanks
Do you mean sitelinks?
Google's systems analyse the link structure of your site to find shortcuts that will save users time and allow them to quickly find the information they're looking for.
They only show sitelinks for results when they think they'll be useful to the user.
You can read more here http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=47334
EDIT
To answer your question, all you can do is make sure you have a well formed site with clear navigation which your users can use and find useful. If your site popular then Google will do the rest.
Google shows highlighted search terms on its cached pages
When you're viewing a cached result the page is stored on Google's servers - so they can modify as they wish (highlighting search terms).
If you're viewing them on actual websites this is due to either:
Google wrapper around the page (such as mobile viewing)
Google toolbar (or similar)

Can I legally redirect users from my commercial app to this web site? [closed]

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The web site in question is www.eventid.net; my web based app will redirect the user to the site and send an event id in the url. The redirect will be: http://www.eventid.net/display.asp?eventid=1003&source=Microsoft-Windows-Security-Licensing-SLC
Do you think I can do this?
I have contacted the site owners with no reply.
It's a public website, of course you can.
It'd be a different matter if you were screen-scraping their results for your own application, but from your description that's not the case.
If you were operating a web site in Germany, and your site had a deep link to a Stackoverflow article, and that article contained copyrighted code from a German company (posted by an employee, for instance), that company could easily get you in trouble at any German court.
US courts have been much more lenient, so if you are doing business solely in the US, I would not worry too much, as long as you don't violate the Terms of Use here.
So, I think the answer "Of course, it is a public site" does not do justice to the potentially complicated legal issues that can arise when you take the question into an international context.
Some examples (only the big ones make it into English language news):
http://www.linksandlaw.com/courtdecisions-germany.htm
http://www.theregister.co.uk/2005/04/11/heise_not_allowed_to_mention_slysoft/
http://news.cnet.com/8301-1023_3-10064740-93.html
Read through their Terms of Use carefully. Make sure you avoid violating their trademark. If it's not clear that you are redirecting to an external site, you may want to make it clear so your users aren't confused.

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