I swear my chair moved

Earthquake in Indonesia have been so frequent these days that people don't bother. I was sitting in chair and I felt it was moving for a bit. I was deeply concentrated in work and I thought probably my head was spinning. Then the shaking was no more. I asked my family members who did not feel anything probably it was for a brief period - 5 seconds or so. No apparent damages in Jakarta.

And a while after a twitter message came up:

W7VOA: Another quake has just rattled Indonesia -- M6.4 prelim -- probably not big enough to trigger tsunami.

I searched the internet and saw in Detik news that the earthquake happened. USGS Earthquake Hazards Program confirms:

Magnitude	6.5
Date-Time	Friday, October 16, 2009 at 09:52:52 UTC Friday, October 16, 2009 at 04:52:52 PM at epicenter
Location	6.692°S, 105.153°E
Depth	55.6 km (34.5 miles)
Region	SUNDA STRAIT, INDONESIA
Distances	135 km (85 miles) S of T.-Telukbetung, Sumatra, Indonesia 185 km (115 miles) WSW of JAKARTA, Java, Indonesia 185 km (115 miles) W of Sukabumi, Java, Indonesia 270 km (165 miles) W of Bandung, Java, Indonesia
Location Uncertainty	horizontal +/- 12.3 km (7.6 miles); depth +/- 17.5 km (10.9 miles)
Parameters	NST= 33, Nph= 33, Dmin=350.5 km, Rmss=1.41 sec, Gp= 76°, M-type=teleseismic moment magnitude (Mw), Version=7
Source	USGS NEIC (WDCS-D)
Event ID	us2009mva4

More Twitter messages:

RT @BrettMcGuire: 5 seconds in Pondok Indah. Hanging plants are still swinging #Jakarta #earthquake

I am amazed that because of Twitter I could confirm the news within 10 minutes.