Thomas Sturm@tsturm@famichiki.jp
If you are interested in earthquake activity either along the US Westcoast or in Japan, here are two bots reporting on quakes in those areas:
Western Quakes Bot - quakes above magnitude 2.0: @westquake@geodata.nexus
Japan Quake Bot - quakes from magnitude 3.0 up: @japanquake@geodata.nexus
Both bots lag the real world by about 5-10 minutes.