BEIRUT - Syria's Internet started working again on Wednesday evening, a US web tracking firm said, and residents reported phone lines were back up after an eight-hour blackout left much of the population cut off from the outside world.Communication networks have been crucial for opposition activists trying to get out videos and information about a two-year conflict that has killed at least 80,000 people, according to a rights group opposed to President Bashar Assad."Internet came back at 15:26 UTC (18:26 Damascus time). Duration 8h25m," Renesys said on its Twitter account.This is the sixth communications blackout of the revolt and web tracking firms say the government is probably responsible. Authorities blamed a blackout last week on a malfunctioning fiber optic cable.