That is an excellent question. Both are common bird species, and both have a "blue" member: the blue-footed booby and the blue tit.
"The boobies are part of the family Sulidae, a group of seabirds closely related to gannets. The true boobies all belong to the genus Sula. [Boobies are] large birds with long pointed wings and long bills. They hunt fish by diving from a height into the sea and pursuing their prey underwater. ... These are colonial breeders on islands and coasts, which normally lay one or more chalky blue eggs on the ground or sometimes in a tree nest. Their name is possibly based on the Spanish slang term _bubi_, meaning "dunce," as these tame birds had a habit of landing on board sailing ships where they were easily captured and eaten" (http://en.wikipedia.org/wiki/Booby ).
The blue tit is "[Great Britain's] commonest tit. Widely and abundantly distributed over most of Britain, absent only from bare uplands and outlying islands of the northwest" (http://www.birdsofbritain.co.uk/bird-guide/blue-tit.asp ).
T.its are of the family called "Paridae ... a large family of small passerine birds which occur in the northern hemisphere and Africa. Most were formerly in the genus Parus. These birds are called "chickadees" (onomatopoeic, derived from their distinctive "chick-a dee dee dee" alarm call) or "titmice" in North America, and just "t.its" in the rest of the English-speaking world. ... These birds are mainly small stocky woodland species with short stout bills. Some have crests. They are adaptable birds, with a mixed diet including seeds and insects. Many species will live around human habitation and come readily to bird feeders for nuts or seed, and learn to take other foods. In Britain, great t.its and blue t.its famously learned to break open the foil caps sealing bottles of milk that had been delivered to homes to get at the cream floating on top" (http://en.wikipedia.org/wiki/Chickadees ).
So they're very different, as you can see.