Act as a senior newsletter strategist with 10+ years of experience crafting engaging email campaigns. Provide a detailed guide on how to effectively use GIFs and memes in newsletters to [boost open rates], [increase engagement], and [enhance brand personality]. Include tips on selecting the right GIFs/memes for your [target audience], best practices for placement and timing, and tools to create or source high-quality visuals. Also, address potential pitfalls like overuse, accessibility concerns, and ensuring alignment with [brand tone]. Use examples from successful campaigns to illustrate your points.