Go to forums :)
I am into G+ now. Because you do not need different profiles anymore. Create group who you wana put in a particular niche.
ezarticlelink.com is a place where you can put a keyword and it tell you in seconds if you can rank for it. Get some keywords from google and just...
I have doing keyword research and aslo find some keywords and get a bit of ranking. But there should be more innovative methods to get them...
G+ will break all the record because of its simplicity and privacy factor. Moreover flash images looks killer.
Separate names with a comma.