I don't know if this culturestom is popular in other countries, but theis day is sometimes calledreferred to as April Fool's Day in Japan. I don't know if this custom is popular in other countries, but this day is sometimes referred to as April Fool's Day in Japan.

Although I've never heard of its exact origin, it's seen as the day when we're allowed to tell a lie (as long as it's funny). Although I've never heard of its exact origin, it's seen as the day when we're allowed to tell a lie (as long as it's funny).

Some companies utilize this culture as one of thefor marketing waycampaigns because if they can offer a witty joke, that would spread immediately through the internet with that/the company's name. Some companies utilize this culture for marketing campaigns because if they can offer a witty joke, that would spread immediately through the internet with that/the company's name.

“Marketing campaigns” is a more commonly used expression.

Some companies utilize this culture as one of theonvention as a marketing waysstrategy because if they can offer a witty joke, thait wcould spread immediaterapidly through the internet along with that company's name. Some companies utilize this convention as a marketing strategy because if they can offer a witty joke, it could spread rapidly through the internet along with that company's name.

A few corrections here. "Culture" is a little too broad, changed this to "convention". "As one of the marketing ways" can be replaced with "as a marketing strategy". Seeing that you use "strategy" in the following sentence you could also say "marketing approach". People would understand if you say "it would spread immediately", but it can sound a little more natural if you say "it could spread rapidly".

Some companies utilize this culture as one of thea way of marketing ways because if they can offer a witty joke, thait would spread immediately through the internet with that company's name. Some companies utilize this culture as a way of marketing because if they can offer a witty joke, it would spread immediately through the internet with that company's name.

You could say "as one of their marketing strategies" also.

It's not so easy to think of a joke that doesn't make anyone uncomfortable. It's not so easy to think of a joke that doesn't make anyone uncomfortable.

WMaybe we can look up some corporate failures on April Fool's Day. Maybe we can look up some corporate failures on April Fool's Day.

It might be too risky to do any special or unusual thing today, as people all over the world monitor each other on SNS/social media. It might be too risky to do any special or unusual thing today, as people all over the world monitor each other on SNS/social media.

SNS is commonly referred to as “social media” in many English-speaking contexts.

It might be too risky to do any special or unusual thing today, as people all over the world monitor each other on SNSsocial media. It might be too risky to do any special or unusual thing today, as people all over the world monitor each other on social media.

In English, SNS is a very academic way of referring to that kind of site. Most people just call them social media.