Hi Ronny,

Please follow the steps below:
Twitter
1. Edit your Twitter application.
2. Check website URL, Calback URL make sure they are the same as your site domain (http://www.yoursite.com and http://yoursite.com make a big difference)
3. Check if the Access level is Read and Write
4. Check if "Allow this application to be used to Sign in with Twitter"
is ticked under Settings
5. Reset the keys then refresh the page
6. Generate a new access token
7. Go to the EasyBlog -> Autoposting -> Advanced Settings page and revoke the access.
8. Go though the EasyBlog -> Autoposting -> Step by step guide and re-enter the new keys and reauthenticate the Twitter access.

LinkedIn
1. Edit your LinkedIn application.
2. Check Website URL, and JavaScript API Domains make sure they are the same as your site domain (http://www.yoursite.com and http://yoursite.com make a big difference)
3. Revoke and regenerate OAuth Keys
3.5. rw_nus must be checked
4. Go to the EasyBlog -> Autoposting -> Advanced Settings page and revoke the access.
5. Go though the EasyBlog -> Autoposting -> Step by step guide and re-enter the new keys and reauthenticate the LinkedIn access.

note: check this http://content.screencast.com/users/nikfaris/folders/Jing/media/586889a2-36b3-4d11-9ce2-e44638502c83/2014-01-16_1239.png

If you still having this issue, can you provide us with Twitter account and Linkedln account so that we can assist you further.