Optional relationship with Cypher - neo4j

Question

Got a wall post type scenario where I'd like to spill out posts by you, your friends, and sort them chronologically with a limit
Is there a way to do this without using a union?
like, I'd almost like something like this (if you'll forgive the pseudo-query):
match (a:Account)-([:FRIEND]->(friend:Account)-)?[:POST]->(post:Post)
where id(a) = 0
return friend,post
I'm just wondering how to get your posts as well as your friends posts in one query
Right now I have (0 is the id of the logged in account right now):
match (a:Account)-[:FRIEND]->(friend:Account)-[:POST]->(post:Post)
where id(a) = 0
return friend,post
union
match (friend:Account)-[:POST]->(post:Post)
where id(friend) = 0
return friend,post
order by post.date_created DESC
limit 10
and while this works in acquiring all the desired posts I want (according to my tests), the order by only seems to organize based on the individual result sets and not as the whole unioned result set
basically this should not be my resulting json:
[{"id":4,"date_created":1438621410,"content":"This is a test post!","account":{"id":10,"username":"test","email":"test#test.com"}},{"id":5,"date_created":1438621422,"content":"about to try this thing","account":{"id":0,"username":"test2","email":"test2#gmail.com"}}]
it should be
[{"id":5,"date_created":1438621422,"content":"about to try this thing","account":{"id":0,"username":"test2","email":"test2#gmail.com"}}, {"id":4,"date_created":1438621410,"content":"This is a test post!","account":{"id":10,"username":"test","email":"test#test.com"}}]
any pointers?

Answer 1

Brian Underwood's answer happened to lead me in the right direction but ultimately the solutions attempted yielded not quite right results
However after some tinkering I did manage to stumble upon this winning query:
MATCH (a:Account)-[:FRIEND*0..1]->(friend:Account)-[:POST]->(post:Post)
WHERE id(a) = 0
RETURN friend,post
ORDER BY post.date_created DESC
LIMIT 10
Hopefully this helps others using Neo for acquiring Facebook "Wall" like updates which include your own posts.
Any improvements to this query would be welcome however, I have no idea how efficient it really is, only that it does indeed sort properly and to my knowledge so far limits accordingly

Answer 2

I think that you could do this in one of two ways:
MATCH (a:Account)-[:FRIEND]->(friend:Account)-[:POST*0..1]->(post:Post)
WHERE id(a) = 0
RETURN friend, post
ORDER BY post.date_created DESC
LIMIT 10
I think that friend would be NULL in the cases where it's a post belonging to the first account. This also should work:
MATCH (a:Account), (post:Post)
WHERE id(a) = 0
OPTIONAL MATCH (friend:Account)
WHERE
a-[:POST]->post OR
a-[:FRIEND]->friend-[:POST]->post
RETURN friend, post
ORDER BY post.date_created DESC
LIMIT 10
Do either of those get you what you want?