MIST

1. The title of this puzzle tells you what the words below have in COMMON. Can you determine what it is?

BEAM

GRIM

SLAM
MASK 

COMMON

2. The following three words can each be preceded by three letters to make new words. The three preceding letters are different for each word and form "words" which are extremely common in a certain context.

AN

WORK

POUND

HINT:

2)
A. The context is the Internet.
B. A "dot" is involved.

Answers:

1. The letter M in each word can be replaced by T to make a new word. The connection to the title is MIST = M is T.

(BEAT/GRIT/SLAT/TASK/COTTON)

2)

.ORGan

.NETwork

.COMpound