Module for providing users easy access to all social networking websites
You are inconsistent in naming. Some of your methods are in camelCase and some are in under_score format. Pick one.

Where is the consistent API for the various social networks?? From your write up I expect to be able to write something like the following:

my_friends = []
for soc in my_social_networks:
    my_friends.append(soc.get_friends())
show(my_friends)


or:

my_messages = []
for soc in my_social_networks:
    my_messages.append(soc.get_current_messages())
show(my_messages)


Instead I see get_tweets or get_wall. That means I have to pay attention to whether I have a Twitter object or a Facebook object. So all of my code needs to have a long if/else for each new type of social network I want to support in my program.

Double underscores are not meant for code outside of Python. Use a single underscore.