I saw some Drones and Threads in the forum, but can't understand its precise meaning. They are all used as noun in plural, such as the subject "General Discussion Threads" and "drones"(sounds like a derogatory word) Can somebody help me on this? Thanks!
What I looked up in dictionary:
drone: n.
1. A male bee, especially a honeybee, that is characteristically stingless, performs no work, and produces no honey. Its only function is to mate with the queen bee.
2. An idle person who lives off others; a loafer.
3. A person who does tedious or menial work; a drudge: "undervalued drones who labored in obscurity" (Caroline Bates).
4. A pilotless aircraft operated by remote control.

thread: n.
1.
a. Fine cord of a fibrous material, such as cotton or flax, made of two or more filaments twisted together and used in needlework and the weaving of cloth.
b. A piece of such cord.
2.
a. A thin strand, cord, or filament of natural or manufactured material.
b. Something that suggests the fineness or thinness of such a strand, cord, or filament: a thread of smoke.
c. Something that suggests the continuousness of such a strand, cord, or filament: lost the thread of his argument.
3. A helical or spiral ridge on a screw, nut, or bolt.
4. Computer Science
a. A portion of a program that can run independently of and concurrently with other portions of the program.
b. A set of posts on a newsgroup, composed of an initial post about a topic and all responses to it.
5. threads Slang Clothes.