What's the easiest method to store texting texts in large/large internet sites: BLOB or regular text in table or something like that else? Database: MySQL.

You will find lots of questions you have to request yourself when creating that call. There is a very detailed article, To BLOB or not to BLOB, that is the question: Whether to store string in BLOB, or CHAR, or VARCHAR?, that discusses a few of the points to consider.

If by "messages" you mean something similar to SMS or IRC, stuff having a defined limit i quickly think VARCHAR is easily the most appropriate. In case your messages can definitely be any size then TEXT could be better.

However I wouldn't have believed BLOB was appropriate for anything except possibly accessories (presuming the body has them). BLOBs aim at binary files (e.g. images, Word documents) not pure text.