You open yourself to access you most likely don't want to give. An access token is a way for a user to state that they are giving limited access for an application to see data.
Copy pasting the access_token means that you bypass the OAuth flow that prevents any hijacks of your account.
The access_token is in plain sight because the
redirect_uri is set to http://facebook.com which doesn't handle the response.
Gives the intruder (https://www.facebook.com/SpritzNetworks) access to the following
Many shady pages, use Xperia app as a way to coax users into giving their access token
Summary: Don't give out your access_token, you aren't even supposed to know it exists in the first place.