Which instant-messaging program, introduced in November 1996, took its three-letter name from the phrase "I seek you"?

Rhythmic, artistic and trampoline are three Olympic disciplines of which sport? Three Georgians have served as Speaker of the House: two Democrats and, from 1995 to 1999, which Republican? Sensory, motor and mixed are the three kinds of what body structures? What three-letter name is shared by U2's breakthrough 1983 album and the band Eric Burdon teamed with for "Spill the Wi… What was the three-letter title of Mae West's 1926 Broadway play that she wrote, produced and directed, and served jail… What three-letter word begins the titles of the Best Picture Oscar winners for 1930, 1949 and 1950? Igneous and metamorphic are two of the three main types of rock. What is the third? Three men from Yemen sued NASA in July 1997, claiming which probe was trespassing on their planet, Mars?