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Roushan kumar
Updating data
I did not new about how much space they provide on free developer account, now after I have mistakenly upodated all my linkedin contact. It will not let me add any data neither delete it. Any other option.
You can also delete data via the Developer console: http://salesforce.stackexchange.com/questions/16107/developer-console-delete-multiple-records
Or, you can always just fire up another dev org and start over!
"Note: You have reached the maximum number (250) of deletable Contacts at one time. If you would like to delete more Contacts, first delete the ones below and then perform another mass delete."
First take backup of all your data, then extracted to csv file and uploaded it to dataloader.io. then select "delete contacts" option and selected contact id to delete all.