2008:
- a number
- a year
Either the image has "2008" written somewhere on it, or it makes a reference to the year 2008.
Also when 2008 appears as a tag when searching through pixiv.
2008 AD 
Edit
2008 is the year of the rat.
In the United_States, a financial collapse happened.[1]
Digital content was published, such as a listverse.com article.[2]
