I checked mine and I’m clean.
A friend just brought me his wife's 11" Macbook Air. . . and the Safari on it was crashing on startup for her and all of her family member's users profiles. . . It was Genieo ad-ware. Took me a bit to locate all pieces of this load of mal-adware and delete them.
It came in on her latest update of damned Adobe Flash!! The dates co-incide on the file installs. It can't have come in anywhere else. . . I knew exactly what to look for and what to delete. Deleted the files and Safari started up perfectly again.
Always uncheck the extras check boxes when installing Flash if you must install it. . .