In the Dead of Night

Enter Slim. He's just moved from the big city to a small town in the middle of nowhere for mysterious reasons. Life is good. He is making friends, things are starting to look up. Then on the day of a national celebration, as he goes on an errand for one of his new friends, he sees something horrible on the edge of the forest. As it stares at him, he awakes eight days later, and his friend is missing. Also, those flowers she wanted? Freshly picked next to him in bed.

Oh, I forgot to mention something. Slim's full name is Slim Hooves, he moved from Canterlot to Ponyville, the celebration is the Summer Sun Celebration, the forest is the Everfree Forest, and his friend is Lyra Heartstrings. This is a slenderblog made in Equestria.

Found here: http://ponyinthedeadofnight.blogspot.com/ and sister blog http://lonelyobservitory.blogspot.com/

The blog provides examples of:

 * Crossover: Between The Slender Man Mythos and My Little Pony Friendship Is Magic
 * Creepy Child: Or rather, foal.
 * I Will Find You: Slims search for both Lyra and the Filly
 * The Calls Are Coming From Inside the House: In this case the POSTS are coming from Slims computer
 * Alternate Timeline