Proof that social media will continue to play a big role in politics after the election, the White House has been encouraging people to use the hashtag #my2k as it urges Congress to preserve tax cuts for the middle class. (The “2k” refers to the $2,200 income tax hike that will take effect for households making $250,000 or less if a deal is not reached by January 1, 2013). Now, however, the conservative Heritage Foundation has hijacked the hashtag: If you search for #my2k on Twitter, a promoted Tweet from the Heritage Foundation, with a link to an anti-”tax the rich” op-ed, is currently the top result. [Source: Twitter]