Stickers get handed around like business cards so the stickers on your laptop/fridge are almost like a record of the people you met.
If you keep your eye out for stickers, you'll start to notice them at many types of smaller establishments like cafes, book stores, boutiques, breweries, music venues, galleries, etc... they're often by the register, and sometimes free!
As a long time sticker collector, I love how the stickers found at random places have some memories attached to them. Finding them, especially when traveling, sometimes feels like finding treasure!
Only one simple non-computer related sticker to: - hide the logo of the laptop company - recognize my work laptop at airports security checks
Simply because i do not what to exchange my work laptop, with another traveler by mistake.