Tumblr support – includes receipt confirmation email; initial response within two hours; problem solved two hours. [Based on five requests/problems]
Twitterfeed - [GetSatisfaction]; initial reply after 20 mins and problem solved. Earlier problem initial reply one hour, problem solved after a day with constant company interaction. [Based on two problems]
I want Sandy – [GetSatisfaction]; initial reply two hours; problem solved after six hours. [Based on one problem]
WordPress.com – no confirmation email; initial response on average six hours [strangely it's longer now that they're operating a 24h support]; problem solved on average after fifteen hours total. [Based on 18 requests/problems]
Twitter - [GetSatisfaction]; initial reply whenever they feel like it; problem whenever and if they feel like it. [Based on at least eight problems..]
Five free to use companies, five different ways of dealing with their customers.. Obviously this is only my own observation based on my experiences.