, devised in conjunction with advertising agency Glue and experiential agency Amplify, uses Facebook to seek out the UK's most popular party idea.
The new competition invites party planners, club promoters and revellers to submit their ultimate party manifesto. The winner will receive £30,000 to spend on making their dream party a reality.
The search for the most popular party idea is open to all fans of the .
A shortlist of the 25 best entries will be chosen by a panel including Johnno Burgess from Bugged Out!. Fans of the page will then be encouraged to vote for their favourite idea to be in with a chance of attending the January 2010 party if the idea they back wins.
The first Seriously Social competition received 58,000 votes over a two-week period. The winner, Michael O'Shea, won the chance to work with a professional production team to put on an authentic 1920s party for £25,000.
Marc Allera, sales and marketing director at 3, said: "We're really excited to be launching our second Seriously Social competition.
"The existing community of 58,000 fans from the first Seriously Social, plus the extra elements added to this year's campaign, will encourage some incredible party idea entries. We can't wait to see what the public come up with."