Google+ gets hashtag support and real-time search
plus.google.com
plus.google.com
Am I missing something?
##android?
I kid.
You can search for the full hashtag string (hash + word) in normal G+ search. I also noted a couple of days ago that the "Sparks" feature seems to have been revamped into a G+ permasearch / saved search. Your sparks now default to "Everything" searches (people, posts, Web, not sure about comments). And you can save any given G+ search to create a new spark.
Not sure if they're going to retain the name or if they're done messing with this feature yet, but it's one of the first things in a long time (well, a couple of months) that I've seen on G+ that struck me as useful and cool (granted, there's been a lot of under-the-hood tinkering and some interesting features released).
The whole Real Names / #nymwars situation has really, really dented my interest and faith in Google though.
Also, danmaz74 has a point. If you search for #Android, you should see only posts containing the hashtag "#Android" and then sort them out by relevancy, and so on. But 100% of the posts should have the hashtag in them if that's what the user was searching for. For non-hashtag queries they can use their regular relevancy algorithms.
I'd like to see some sort of ranked system. Google does really good for relevance, but timeliness also matters. Some sort of score where a relevant / trusted but not quite-so-recent post gets promoted on top of spambots would actually be a Good Thing[tm].