Series tracking sites I've used:
I also make heavy use of Goodreads and have no complaints about Goodreads' having ever invaded my privacy or shared unwanted information; one can configure Goodreads' settings to achieve desired levels of privacy or sharing - both at Goodreads and at other social media sites, such as Facebook. However, for greater peace of mind, you could create an "alias" email address or an actual dedicated email account for use with Goodreads, that won't have any contacts for Goodreads to find.