I am trying to use the Social features of Mathematica 10. The Facebook interaction works, but with Twitter I am getting "Cannot import data as JSON".
Example:
In[16]:= ServiceExecute["Twitter", "LastTweet", {"ScreenName" -> "stephen_wolfram"}] During evaluation of In[16]:= Import::fmterr: Cannot import data as JSON format. >> Out[16]= ServiceExecute["Twitter", "LastTweet", {"ScreenName" -> "stephen_wolfram"}] I have tried ClearSystemCache[] but this has no impact. I am getting the valid token from Twitter and it is marked as an allowed App with read access.
If I use SocialMediaData[] it fails but returns numbers. Example:
In[17]:= SocialMediaData["Twitter", "Followers"] // Short Generates this: 
Can anyone tell me what I am doing wrong, or how to diagnose/solve this?
[Edit]
Further testing.
Restarting the client then ServiceExecute[] works. However SocialMediaData[] doesn't. Restarting the client and running SocialMediaData[] first fails but displays some names. Eg.

Also I've noticed that ServiceExecute allows you to save your Auth key, but SocialMediaData doesn't.