The bullshit patents that IBM threatened to sue Twitter over were for url shortening [1], inline user-customized advertising[2], and diff-ing contact lists[3].

The bullshit patents that IBM threatened to sue Twitter over were for url shortening [1], inline user-customized advertising[2], and diff-ing contact lists[3]. [1] http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=6,957,224.PN.&OS=PN/6,957,224&RS=PN/6,957,224 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=H... [2] http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=7,072,849.PN.&OS=PN/7,072,849&RS=PN/7,072,849 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=H... [3] http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=7,099,862.PN.&OS=PN/7,099,862&RS=PN/7,099,862 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=H...