Wikipedia:Articles for deletion/Twittersphere
Term gets plenty of use in RSes http://news.google.com/news?client=firefox-a&rls=org.mozilla:en-US:official&channel=s&hl=en&q=Twittersphere&um=1&ie=UTF-8&sa=N&tab=wn and http://books.google.com/books?id=pgwvPjjZ5mcC&pg=PT59&dq=Twittersphere&ei=2ixESpSLK4mGNbiqzMgO&client=firefox-a pretty much defines the term.  I think this meets the requirements of  —&nbsp;Preceding Wikipedia:Signatures|unsigned comment added by
— User:Hobit, NONE
Stance: keep
Cited policy: WP:NNN (Wikipedia:Wikipedia is not a dictionary)