Iam implementing facebook and twitter using sharekit for an iphone app. How can we get the user id of the logged in user so that I could send it to the server. Any help will
Did you try Step 3 of the installation for Sharekit?
Step 3: Filling in API Keys
Most of the web services that ShareKit integrates require you to use an API key when connecting. An API key is a unique identifer that tells the service what app is making the request.
You have to sign up for each api key, but they are all free and sign-ups are quick.
Locate and open the file SHKConfig.h, just inside the ShareKit group in your project's file list.
At the top you'll find a list of services that require api keys. Each service has a link next to it. Follow the link for each service to get an api key. Fill in the api key for each corresponding service within SHKConfig.h.
Note: Follow the comments within the SHKConfig file, they provide additional steps and possible customizations for each service.
For the full documentation see http://www.getsharekit.com/install/ and http://www.getsharekit.com/docs/