Formal:
* Talaarawan sa Web (literally: "web diary")
* Blog (simply using the English word)
* Talasulatang Pang-Elektroniko (literally: "electronic writing")
Informal:
* Blog (again, simply using the English word)
* Online na Talaarawan (literally: "online diary")
* Pang-araw-araw na Talaan sa Web (literally: "daily web log")
The best translation depends on the specific context and audience. For example, if you are writing for a general audience, you could use the more casual "blog" or "online na talaarawan." If you are writing for a more formal setting, you might use "talasulatang pang-elektroniko" or "talaarawan sa web."